former secretary of state hillary clinton. >> to deny the opportunity to any of our daughters and sons, solely on the basis of who they are and who they love, is to deny them the chance to live up to their own god-given potential. >> secretary clinton weighing in. >>> and now, we turn to major news for millions of women in america on screening for breast cancer. a new study today revealed 60% of abnormal mammograms turn out to be false positives, not cancer at all. even though they can lead to biopsies, even surgery. and abc's cynthia mcfadden takes us into the reality of that experience. >> reporter: judy valencia says she never missed a mammogram appointment. >> my sister had breast cancer, my mother had breast cancer and my three aunts also had breast cancer. >> reporter: three years ago, her mammogram detected an anomaly and a biopsy revealed she had cancer. judy decided to remove both breasts. >> i just wanted it to be done. i didn't want to have to worry. >> reporter: but judy says she couldn't get paperwork from the hospital for her insurance, so, she hired a lawyer. he sent jud